A .20 kg hockey puck is launched up a metal ramp that is inclined at a 30.0 degree angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are
Ms= .40 kg and Mk=.30 kg , respectively. The puck's initial speed is 35.0 m/s. What is the magnitude of the acceleration of the puck on the ramp?
The Attempt at a Solution
Fgrav= mg(cos 30- sin 30)
In the j direction the forces are:
In the i direction the forces are:
mgcos(30) + MkN=ma
a= (mgcos(30)+ MkN)/ m =a
then when I plug in all of the given numbers I get -1.4.
I have tried this problem a bunch of times and cannot get anywhere close to the correct answer. What am I doing wrong?